https://stackoverflow.com/questions/38593515/warning-sanitizing-unsafe-style-value-url

https://github.com/angular/angular/issues/13849

https://github.com/ionic-team/ionic/issues/7552

import { Pipe, PipeTransform } from '@angular/core';import {DomSanitizer} from '@angular/platform-browser';@Pipe({ 	name: 'trustAsResourceUrl' })export class TrustAsResourceUrlPipe implements PipeTransform {	constructor(private sanitizer:DomSanitizer){}	transform(url:string) {		//let sanitizedUrl = this.sanitizer.bypassSecurityTrustUrl(url);		//		let sanitizedUrl = this.sanitizer.bypassSecurityTrustResourceUrl(url);		return sanitizedUrl;	}}